Sophos
Anti-Virus for UNIX/Linux can be configured not to scan items that are beyond the starting filesystem (i.e. not to traverse mount points) with the
--stay-on-filesystem option.
By default, Sophos Anti-Virus for UNIX/Linux will not scan items on remote computers (i.e. will not traverse remote mount points). You can enable remote computer scanning by using the --no-stay-on-machine option.
NOTE: The above options are applicable to on-demand scans executed with sweep (SAV4) or savscan (SAV7/9).